美女寫真

A 30-pF air-gap capacitor has circular plates of radius R = 10 cm. It is connected with a voltage source V(t) =100sin(120t). Find (a) the current I(t) into the plates, and (b) the electric field E(t) between the plates. (c) Determine the magnetic field B(r, t) induced between the plates. Assume E is uniform between the plates. 這是圖片網址//www.wretch.cc/album/show.php?i=nayuki315&b=1&f=1387292921&p=2小弟想請教各位物理好的大大們解答。希望物理好的大大們能夠不吝指導。 麻辣 ( 知識長 ) 數學 | 物理 2013-06-08 07:22:48 A C=30(pF) air-gap capacitor has circular plates of radius R=10 cm. It connect a source V(t)=100sin(120*t). Find (a) the current I(t) into the platesi(t)=C*dV/dt=30*10^(-12)*100*120*cos(120t)=0.36*10^(-6)*cos(120t)[amper](b) the electric field E(t) between the plates. E(t)=k*Q/r^2=k*C*V(t)/R^2=9*10^9*30*10^(-12)*120sin(120t)/100=0.324(N/Coul).........ans(c) Determine the magnetic field B(r,t) induced between the plates. Assume E is uniform between the plates. B(r,t)=k'*i(t)/r=10^(-7)*0.36*10^(-6)*cos(120t)/r=0.36*cos(120t)/r*10^(13)......ans 2013-06-08 07:26:18 修正(c):B(r,t)=2k'*i(t)/r=2*10^(-7)*0.36*10^(-6)*cos(120t)/r=0.72*cos(120t)/r*10^(13)[weber/m^2]......ans 2013-06-08 07:27:21 B=0.72*cos(120t)/r*10^(13)/r [weber/m^2]......ans 2013-06-08 07:28:00 上列取消 circular plates,大學普通物理,magnetic field,electric field,voltage source,radius,大學,物理,air-gap capacitor,120t ( 0 ) | ( 0 ) ( 0 ) 感謝大大詳細寫下所有的做法。 [ 工程科學 ] 關於材料力學的一些問題 [ 英文 ] 我需要5份英文食譜 [ 英文 ] 誰能幫我翻譯這一段文章(文章要通順) (0) (0) (0)